You want to host a LAN party? LANAddict
has some LAN Party Economics 101.

One final method for procuring a location for cheap, which I use, and I
noticed only a few other LANs using is holding your LAN party as a charity event.
It is not hard to find a decent location for cheap or free when they hear of
your plans. Again, this is much easier to do if you know someone at the location
you plan on using. If you use this method, I think you will find that the other
costs will be easier to manage as well.